RPL Liquid-Cooled Reactors

Superior Cooling Technology. Highest Power Density. Heavy-Duty Solution.

Product Overview

RPL Liquid Cooled Reactors are robust, heavy duty filtering solutions for demanding installations. Whether it be the line side of an active front end rectifier, the load side of a drive inverter, or anywhere in between, these heavy duty reactors will stand up in some of the most demanding applications. The largest companies in the world rely on CTM technology, with more than 200,000 installed units in some of the harshest environments on the planet.

Reactor Applications

  • Protect Drive Electronics and eliminate expensive downtime
  • Reduce Harmonic Distortion by absorbing voltage spikes
  • Protect Motor Insulation and protect sensitive electronics
  • Protect Long Motor Cables up to 300 feet

Liquid Cooled Advantages

  • Highest Power Density
  • Lowest Audible Noise with magnetostriction-free design and epoxy enclosed magnetics
  • Sealed Design for Harsh Conditions from nearby electronics
  • Thermally Isolated from Ambient for lower cabinet temperatures
Impedance Levels

3%, 5%, and 7% (at 480 V)

Typical Applications

Load Reactors Line Reactors (active front ends) Line Reactors (bridge rectifiers) Other Heavy Duty Applications

Voltage Range

Up to 690 V

Fundamental Frequency

6 - 70 Hz

Maximum Altitude

No Limit

Switching Frequency

Up to 20 kHz Above 8 kHz, contact CTM for application verification

Current Range

65 - 1,440 A

Overload Capability

200% rated current for 1 minute

Maximum Coolant Temperature

50 °C (122 °F) (higher with de-rating)

Inductance Curve

85% at 150% load 74% at 200% load 60% at 300% load

Approved Coolants

Drinking Water Water-Glycol mixture For R134A, contact CTM

Cooling System Options

Aluminum (standard) Copper

Heat Removal

97% to Liquid Coolant 3% to Ambient Air

Maximum Ambient

70 °C (158 °F)

Agency Recognition

cЯUus 1446

Product Highlights

  • Drive Protection (Line Side): RPL Reactors absorb voltage spikes, voltage transients, and other power line disturbances, minimizing nuisance drive trips and reducing harmonic distortion. Perfect for 6-pulse bridge rectifiers, or as the grid or drive side inductor in an LCL filter for active front end rectification.
  • Reduce Harmonic Distortion (Line Side): Rectifiers can create nonlinear loads and impose harmonic distortion on the grid; RPL Reactors provide impedance and filtering to reduce harmonics, helping applications meet IEEE 519.
  • Motor Protection (Load Side): When installed at the output of a VFD or inverter, load reactors limit voltage spikes that can break down motor insulation.
  • Long Motor Lead Protection (Load Side): When used as a load reactor, RPL Reactors allow worry free operation with motor lead lengths up to 300 feet.
  • Heavy-Duty Solution: Compared to the RLL Line Reactors, RPL Reactors are intended for both line and load side reactor applications. They also perform well with active front end drives and operate at higher efficiencies.

Liquid Cooled Advantages

  • Highest Power Density: Superior heat removal technology enables smaller magnetics, yielding the highest power density reactors available. Low surface temperatures eliminate clearance requirements, further increasing “effective” power density.
  • Thermal Isolation: With up to 97% of heat removed through the coolant, liquid cooled reactors have negligible effects on cabinet air temperature. No climate control required.
  • Sealed Design for Harsh Environments: RPL Reactors are environmentally sealed, creating an extremely rugged and reliable design ideal for use in the harsh environments.
  • Extremely Low Audible Noise: Due to superior materials and geometric shapes, magnetostriction-induced noise is significantly lower in CTM Reactors. When combined with a sealed package, the result is a nearly silent solution.

Thermal Isolation

CTM liquid cooled reactors will have negligible temperature effects when installed in an existing cabinet. Liquid cooled inductors are thermally isolated from their enclosures, meaning a majority (97%) of the heat is removed directly through the liquid coolant.

In this example, both an air cooled and a liquid cooled reactor are sized for a 600 HP motor application; both reactors are identically 99.5% efficient (0.5% power loss). The air cooled reactor rejects 3,000 watts to the cabinet air, while the equivalent liquid cooled reactor only rejects 90 watts to the air. The remaining 2,910 watts are removed directly by the liquid coolant.

As can be seen in the graph, in a typical NEMA 3R cabinet, installation of an air cooled reactor will increase cabinet air temperature by 20.9°C . The equivalent liquid cooled reactor raises cabinet air temperature by only 1.4°C. The low temperature rise provided by liquid cooled reactors yields increased reliability for all electronics within the cabinet. Low surface temperatures also allow the liquid cooled reactor to smaller clearances, increasing effective power density further.

RPL Liquid-Cooled Reactors